Letter 4 | Values and Voices. Muslims have been part of this country since its founding. Since nearly a third of all slaves were Muslim, this country literally was built on the backs of Muslims. We have remained important contributors to American history, serving to defend our nation and contributing culturally to what it means to be American. Thomas Jefferson’s copy of the Qur’an sits in the Library of Congress as a testament to how important Muslim thought was to the founding of this country.